Modular Multilevel Converter With Different Submodule Concepts—Part I: Capacitor Voltage Balancing Method
Modular Multilevel Converter With Different Submodule Concepts—Part I: Capacitor Voltage Balancing Method
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DOI：
10.1109/tie.2012.2210378
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发表时间：
2013-10
影响因子：
7.7
通讯作者：
E. Solas;G. Abad;J. Barrena;S. Aurtenetxea;A. Carcar;L. Zajac
中科院分区：
文献类型：
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作者：
E. Solas;G. Abad;J. Barrena;S. Aurtenetxea;A. Carcar;L. Zajac
本文提出了一种模块化多电平变换器（MMC）的调制策略，它提供了组成变换器的不同子模块的电容器的电压平衡。这种调制不仅适用于由经典的两电平（2L）子模块构造的MMC，而且对于具有不同子模块概念的布置也是有效的，例如，如中性点箝位（NPC）、飞跨电容器（FC）、中性点引导（NPP）等拓扑。因此，首先，解释了应用于两电平（2L）子模块概念的一般调制原理，其次，分析了3L-NPC和3L-FC子模块拓扑的扩展。在此之后，所研究的调制策略进行了验证，通过成功的仿真结果，在不同的开关频率和子模块的数量。在真实的测试台架上实施上述调制策略后，本文第二部分给出了相应的实验结果。除此之外，还包括基于热分析和四个研究的子模块拓扑结构之间的元素的大小的比较。
This paper presents a modulation strategy for the modular multilevel converter (MMC) which provides the voltage balancing of the capacitors of different submodules comprising the converter. Not only is this modulation applicable to MMCs constructed with classic two level (2L) submodules, but it is also effective for arrangements with different submodule concepts, for instance, topologies like neutral point clamped (NPC), flying capacitors (FCs), neutral point piloted (NPP), etc. Therefore, firstly, the general modulation philosophy is explained applied to the two level (2L) submodule concept, and secondly, the extension to 3L-NPC and 3L-FC submodule topologies is analyzed. After that, the validation of the studied modulation strategy is carried out by means of successful simulation results, at different switching frequencies and number of submodules. The corresponding experimental results are shown in Part II of this paper after having implemented the aforementioned modulation strategy in a real test bench. In addition to this, a comparison based on thermal analysis and sizing of elements among the four studied submodule topologies is also included.